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System interrupt specifications
Hardware IRQ System function
IRQ0 System timer
IRQ1 Standard 101-/102-Key or Microsoft Natural P/S2 Keyboard with HP QLB
IRQ2 Mobile Intel® 4 Series Chipset PCI Express Root Port-2A41
IRQ3 Intel® ICH9 Family PCI Express Root Port1-2940
IRQ4 Intel® ICH9 Family PCI Express Root Port2-2942
IRQ5 Intel® ICH9 Family PCI Express Root Port3-2944
IRQ6 Intel® ICH9 Family PCI Express Root Port5-2948
IRQ7 Intel® ICH9 Family PCI Express Root Port6-294A
IRQ8 ATI Mobility Radeon HD 4330
IRQ9 Intel® WiFi Link 5100 ABG
IRQ12 Synaptics PS/2 Port TouchPad
IRQ13 Numeric data processor
IRQ16 Intel® ICH9 Family USB Universal Host Controller-2937
IRQ-17 High Definition Audio Controller
IRQ-18 Intel® ICH9 Family USB Universal Host Controller-2939
IRQ-19 Intel® ICH9 Family USB Universal Host Controller-293C
IRQ-20 Intel® ICH9 Family USB Universal Host Controller-293A
IRQ-21 Intel® ICH9M-E/M SATA AHCI Controller
IRQ-22 Intel® ICH9 Family USB Universal Host Controller-2935
*Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none.
NOTE: ExpressCards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either the infrared or the serial
port may assert IRQ3 or IRQ4.
100 Chapter 6 Specifications